Grave Shadows: 5 (Red Rock Mysteries)

Bryce and Ashley Timberline are normal 13-year-old twins, except for one thing—they discover action-packed mystery wherever they go. Whether it's searching for a missing writer or fearing for their lives at the bottom of a canyon, Bryce and Ashley never lose their taste for adventure. Wanting to get to the bottom of any mystery, these twins find themselves on a nonstop search for the truth.